I have an opportunity to acquire 10 cases of recent date code failed Panasonic 12V 7Ah (conservative rating) 20 milliohm internal resistance (lowest I could find) SLA batteries. The cells (UP-RW1245P) are still in their original shipping case and the ones I saw are only 37 days out of date code from the date of this thread. The derating curves are available on the Panasonic website for those who want specifications. These cells would be perfect for any of those interested in doing battery power projects. If you are interested, please reply in this thread how many cells you would like and at the price you wish to pay for each cell not including shipping. In this way, I can make the appropriate offer. This is a not for profit offer and is time sensitive so don't hesitate.

If the price is good, I might go for 8pcs. Regular price from digi-key is $20, so one might expect at least half of that or better

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"Date code failed" means that they were cleared out of stock because they couldn't be sold by the printed datecode on the battery so they couldn't be sold as "fresh". I measured an open case and found all the cells were over 13.5V and in new condition. I guess I should have used a better term

Hmmmm. This battery is rated for high rate discharge for standby power supplies (it's not even given an Amphour rating). The note on the data sheet says "When specific conditions are satisfied, this battery can be used for main power supplies. Please consult Panasonic."

Not trying to torpedo the deal here. I'm interested in buying some myself. But the battery clearly isn't identical to the LC-R127R2P which is designed for main power supplies and I'm wondering how its performance would differ.

These cells were designed for computer UPS. They are low impedence, high output (45W/hr. sustained) cells and as such they don't provide derating curves for low current usage because that is not the target market. By any account, they are a first rate cell. From what I understand about the derating curves presented, a 300mA draw will last about 1000 minutes before requiring recharge. These cells are designed to go deeper into discharge and still keep putting out steady current. The derating curve is not presented below 300mA of draw. I don't know if this means that the cells offer no increase in time usage below that current draw or that the engineers didn't bother to do tests longer than 1000 minutes